Should I keep these heads?

Crap! not sure of the casting #. Navy got me here at work till tomorrow morning. The heads were on a 77 Dodge 4 wheel Drive.

Thinking now maybe to purchase mopar's aluminum LA Heads with 63 cc chamber size. They are listing the exhaust ports at 77cc, is that what the original 340 heads would have been? I don't know why I'm worried about the exhaust ports matching so much?